Better warning messages

modules/logging_colors.py

@@ -0,0 +1,109 @@
+#!/usr/bin/env python
+# encoding: utf-8
+import logging
+# now we patch Python code to add color support to logging.StreamHandler
+
+
+def add_coloring_to_emit_windows(fn):
+    # add methods we need to the class
+    def _out_handle(self):
+        import ctypes
+        return ctypes.windll.kernel32.GetStdHandle(self.STD_OUTPUT_HANDLE)
+    out_handle = property(_out_handle)
+
+    def _set_color(self, code):
+        import ctypes
+        # Constants from the Windows API
+        self.STD_OUTPUT_HANDLE = -11
+        hdl = ctypes.windll.kernel32.GetStdHandle(self.STD_OUTPUT_HANDLE)
+        ctypes.windll.kernel32.SetConsoleTextAttribute(hdl, code)
+
+    setattr(logging.StreamHandler, '_set_color', _set_color)
+
+    def new(*args):
+        FOREGROUND_BLUE = 0x0001  # text color contains blue.
+        FOREGROUND_GREEN = 0x0002  # text color contains green.
+        FOREGROUND_RED = 0x0004  # text color contains red.
+        FOREGROUND_INTENSITY = 0x0008  # text color is intensified.
+        FOREGROUND_WHITE = FOREGROUND_BLUE | FOREGROUND_GREEN | FOREGROUND_RED
+        # winbase.h
+        # STD_INPUT_HANDLE = -10
+        # STD_OUTPUT_HANDLE = -11
+        # STD_ERROR_HANDLE = -12
+
+        # wincon.h
+        # FOREGROUND_BLACK = 0x0000
+        FOREGROUND_BLUE = 0x0001
+        FOREGROUND_GREEN = 0x0002
+        # FOREGROUND_CYAN = 0x0003
+        FOREGROUND_RED = 0x0004
+        FOREGROUND_MAGENTA = 0x0005
+        FOREGROUND_YELLOW = 0x0006
+        # FOREGROUND_GREY = 0x0007
+        FOREGROUND_INTENSITY = 0x0008  # foreground color is intensified.
+
+        # BACKGROUND_BLACK = 0x0000
+        # BACKGROUND_BLUE = 0x0010
+        # BACKGROUND_GREEN = 0x0020
+        # BACKGROUND_CYAN = 0x0030
+        # BACKGROUND_RED = 0x0040
+        # BACKGROUND_MAGENTA = 0x0050
+        BACKGROUND_YELLOW = 0x0060
+        # BACKGROUND_GREY = 0x0070
+        BACKGROUND_INTENSITY = 0x0080  # background color is intensified.
+
+        levelno = args[1].levelno
+        if (levelno >= 50):
+            color = BACKGROUND_YELLOW | FOREGROUND_RED | FOREGROUND_INTENSITY | BACKGROUND_INTENSITY
+        elif (levelno >= 40):
+            color = FOREGROUND_RED | FOREGROUND_INTENSITY
+        elif (levelno >= 30):
+            color = FOREGROUND_YELLOW | FOREGROUND_INTENSITY
+        elif (levelno >= 20):
+            color = FOREGROUND_GREEN
+        elif (levelno >= 10):
+            color = FOREGROUND_MAGENTA
+        else:
+            color = FOREGROUND_WHITE
+        args[0]._set_color(color)
+
+        ret = fn(*args)
+        args[0]._set_color(FOREGROUND_WHITE)
+        # print "after"
+        return ret
+    return new
+
+
+def add_coloring_to_emit_ansi(fn):
+    # add methods we need to the class
+    def new(*args):
+        levelno = args[1].levelno
+        if (levelno >= 50):
+            color = '\x1b[31m'  # red
+        elif (levelno >= 40):
+            color = '\x1b[31m'  # red
+        elif (levelno >= 30):
+            color = '\x1b[33m'  # yellow
+        elif (levelno >= 20):
+            color = '\x1b[32m'  # green
+        elif (levelno >= 10):
+            color = '\x1b[35m'  # pink
+        else:
+            color = '\x1b[0m'  # normal
+        args[1].msg = color + args[1].msg + '\x1b[0m'  # normal
+        # print "after"
+        return fn(*args)
+    return new
+
+
+import platform
+if platform.system() == 'Windows':
+    # Windows does not support ANSI escapes and we are using API calls to set the console color
+    logging.StreamHandler.emit = add_coloring_to_emit_windows(logging.StreamHandler.emit)
+else:
+    # all non-Windows platforms are supporting ANSI escapes so we use them
+    logging.StreamHandler.emit = add_coloring_to_emit_ansi(logging.StreamHandler.emit)
+    # log = logging.getLogger()
+    # log.addFilter(log_filter())
+    # //hdlr = logging.StreamHandler()
+    # //hdlr.setFormatter(formatter())